Question

Solve using linear combination and state your answer in the form (x,y). Please show all your work.

X+y=-3
2x-3y=-21

Answer 1

Answer: x=-6 y=3

Explanation:

In order to solve this equation by linear combination, firstly we have to multiply by 2 the first equation then we must subtract to equation 2, the linear combination obtained for the equation 1.

Finally we have a linear equation for y and the replace the value obtained for y and one equation an get the corresponding value for x.